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Published September 1990 | Published
Journal Article Open

Similarity of the concentration field of gas-phase turbulent jets


This work is an experimental investigation of the turbulent concentration field formed when the nozzle gas from a round, momentum-driven, free turbulent jet mixes with gas entrained from a quiescent reservoir. The measurements, which were made with a non-intrusive laser-Rayleigh scattering diagnostic at Reynolds numbers of 5000, 16000, and 40000, cover the axial range from 20 to 90 jet exit diameters and resolve the full range of temporal and spatial concentration scales. Reynolds-number-independent and Reynolds-number-dependent similarities are investigated. The mean and r.m.s. values of the concentration are found to be consistent with jet similarity laws. Concentration fluctuation power spectra are found to be self-similar along rays emanating from the virtual origin of the jet. The probability density function for the concentration is also found to be self-similar along rays. Near the centreline of the jet, the scaled probability density function of jet fluid concentration is found to be nearly independent of the Reynolds number.

Additional Information

© 1990 Cambridge University Press. Received 1 June 1989 and in revised form 9 December 1989. Published online: 26 April 2006. The authors wish to acknowledge useful discussions with Dr J. E. Broadwell, and thank Professor W. A. Dahm for providing the digitized values of the 'pre-1986' experimental results for figures 6, 7, 10, and 11. These experiments would not have been possible without the electronic wizardry of Dr Dan Lang. Thanks also to Paul Miller for his insightful suggestions, and proof reading of the text. This work was supported by the Gas Research Institute under grants 5083-260-0878 and 5087-260-1467, and the Air Force Office of Scientific Research under grants 83-0213 and 88-0155.

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